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Патент USA US2128711

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‘ Aug. 30, 1938.
'
_
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- G. ‘s. MASLE-N
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2,128,711
FEED ‘APPARATUS FOR GAS ENGINES
Filed Feb. 17,1936
,
2 Sheets-Sheet 1
INVENTOR.
BY
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Mg
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ATTORNEYS
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Aug. 30, 1938.
G. s. MASLEN
2,128,71 1
FEED APPARATUS FOR GAS ENGINES
Filed Feb. 17, 1936 ‘
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v2 Sheets-Sheet 2
5o 41
4
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§
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' INVENTQR.
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‘ ATTORNEYS
o
Patented Aug. 30, 1938
curries stares
FA'E'ENT OFFICE
72,128,711
FEED APPARATUS FOR GAS ENGINES
George S. Maslen, Los Angeles, Calif.
Application February 17, 1936, Serial No. 64,268
11 Claims. (01. 48-180)
The invention consists in the novel parts and
This invention relates to feed apparatus for
connection to the intake'of an engine driven by
a gaseous fuel, and while the invention is capable
of cooperating with carbureted air as the gaseous
fuel, it is particularly intended to be used in con~
nection with engines operating with gas as a fuel.
It is important that feed apparatus of this kind
is operated so as to effect a thorough mixture of
the gaseous fuel and air before the same enters
10 the engine. When using gas engines for driving
any kind of machinery hoists, etc., the engine is
usually connected to the driven shaft through a
combination of parts to be described hereinafter,
all of which contribute to produce an e?icient
ieed apparatus for gas engines.
A preferred embodiment of the invention is de (it
scribed in the following speci?cation, while the
broad scope of the invention is pointed out in the
appended claims.
'
In the drawings:
Figure l is a side elevation of a feed apparatus 10
embodying my invention and‘ representing the
same attached to an engine intake, a portion of
clutch, and when the clutch is open the engine which is shown with a portion of the engine block,
should be permitted to idle at a low speed to save
15 gas consumption by it. When the clutch is closed
it is necessary to supply the engine with an in
creased amount of gas so as to develop the power
necessary to drive the driven shaft under load.
In ordinary gas engine practice it is necessary to
20 adjust the throttle that admits the explosive ad
mixture to the engine to adapt it for idling or for
driving a load. One of‘ the objects of the present
invention is to provide afeed apparatus in which
the throttle of the engine can be left in an open
25 position to supply su?ioient gas to the engine for
operation under load, and in which an additional
admission valve or control valve is provided,
operating in such a way that when the engine is
idling this auxiliary control valve or admission
30 valve will move to a substantially closed position,
in which position it will pass just sufficient gas to
enable the engine to idle; but when the clutch
for driving a load is closed, the auxiliary valve
will open and operate to pass su?icient gas to
35 operate the engine under load. Hence with my
apparatus it is merely necessary to set the throttle
at a position which will drive the engine under
load, and then open and close the clutch when
ever the power is required and without making
40 any change in the throttle position.
A further object of-my invention is to provide
an improved feed apparatus in which the ratio
of the gas and air will be maintained substantially
constant at different driving speeds of the engine;
also to provide feed apparatus in which a thor
ough mixture of the gaseous fuel and air takes
place before the explosive mixture is admitted to
the engine.
A further object of the invention is to provide
a feed apparatus involving my improvements, and
' in which a vaporizable fuel is admitted at sub
stantially the center of an enveloping air cur
rent passing to the engine.
Further objects of the invention will appear
55 hereinafter.
broken away.
>
‘
Fig. 2 is a vertical section through the appa
ratus shown in Fig. 1 upon an enlarged scale, and“
with the upper portion of the intake broken
away.
Fig. 3 is a horizontal section ‘upon an enlarged
scale taken on the line 3—3 of Fig. 1, and par
ticularly illustrating the construction of the
casing and the admission valve that is oontrollled
by the speed of the engine.
Fig. 4 is a cross section taken on the line 4-—-4 of
Fig. 2; and further illustrating means which I
may employ for regulating the amount of air ad
mitted through the apparatus.
‘
Fig. 5 is a fragmentary detailed view broken
away and shown partially‘ in section, and‘ illus=
trating a phase in the operation of the automatic
admission valve.
Fig. 6 is a view similar to Fig. 5, but showing
the admission valve in its “closed” position,‘ at
which time it will pass su?icient gas for permit
ting the engine to idle.
Fig. 7 is a view similar to Fig. 2, but showing
only the lower portion of the apparatus with
certain parts broken away. This view shows the
air valve in its wide open position, while Fig. 2
shows it in a position of rest.
Fig. 8 is a view similar to Fig. 7, but with upper
parts of the mechanism omitted; and this view
particularly illustrates a construction which I
may employ for. enabling the seatof the air valve
to be adjusted toward or from the air valve.
Fig. 9 is a side elevation of a portion of the eas
ing shown in Fig. 8, and further illustrating ‘the
adjusting means;
Fig. 10 is a plan of a spring washer which I
may employ as a spring in the adjustment, of
the air valve seat.
Fig. 11 is a vertical section similar to Fig. '7,
but illustrating another embodiment of the air
valve which I may employ, having a special con
30
35
4:0
45
50
struction for enabling the effective opening for 55
2
2,128,711
air passage to be regulated; and this view also
illustrates the construction which I employ when
the apparatus is to cooperate with a carburetor.
Fig. 12 is a cross section taken on the line
l2-l2 of Fig. 11, passing through the air valve
to illustrate further the means whereby the ef
fective area of the air passages through this valve
may be regulated.
amount of air which can pass the air valve. For
this purpose I provide a damper-like construc
tion illustrated in Fig. 4, and involving the use
of a damper plate 29 having diametrically oppo
Referring more particularly to the parts, and
especially to Fig. 1, illustrating an example of an
installation embodying my invention, the appa
site openings 30 illustrated in dotted lines in Fig.
ratus includes a casing I preferably including a
body or base 2, a bonnet 3, and an outer, or upper,
ring or air valve seat l0. Where this air adjustrnent is provided the seat II] can be rotated
section 4, the latter of which is connected in any
by means of a screw 32 that is secured radially,v
in it, and which passes through a circumferen 15
tial slot 33 in the wall of the base 2. A look
nut 34 may be provided for locking the ring H!
15 suitable manner to the intake 5 of the gas en
gme.
~
Referring to Fig. 2, the bonnet 3 is secured to
the body or base 2 preferably by a disconnectible
metal strap ‘6, and this bonnet 3 tapers in an up
20 ward direction so that it presents on its interior
an upwardly reduced chamber preferably in the
form of a substantially conical chamber '5, the
small end of which connects to a neck 8, that
forms the upper end of the bonnet, said neck
25 preferably having a reduced diameter or re
4, and which can cooperate with similar dia
in any adjusted position. The radial edges. of
the damper plate are formed with upwardly pro
jecting beads 29a and the upper edges of these
beads are about on a level with the upper face
of flange 12. ‘This prevents turbulence in the
air ?owing through.
Preferably in the upper portion of the bonnet
3 I provide a regular throttle valve 35, which can 25
be operated by means of a suitable handle or lever
8 joins the chamber 1.
Within the base and just before the entrance
36 illustrated in dotted lines in Fig. 2. However,
valve It, said air valve preferably including a
35 substantially conical hood l5. This hood is pref -
erably detachably'secured to the disc is of the
air valve. This may be accomplished in any
suitable manner, for example, by means of an
under-cut ?ange I6 and an expanding spring 5?.
40 A similar expanding ring l8 may be provided for
removably securing the valve seat ring it in po
sition, the said spring ring it being received in
a circumferential groove l9 formed on the in
terior of the casing.
The base 2 has a lateral air inlet 2!] for ad
mitting free air, and when the engine is in oper
ation this air forms an air current passing up
through the opening 2! of the valve seat ill, and
this air current lifts the air valve it off of its
50 seat; in other words, the air valve floats on this
air current.
The air valve is wholly unrestrained so that
it is perfectly free to move up and down on. the
air stream, and it is guided in its up and down
45
55 movement as it rides or ?oats on the air current
on a ?xed guide tube 22, and the air valve disc
it carries a tubular valve 23 that telescopes on
this inner tube 22 and is formed atrits upper
end so that it will operate as a valve seating
60 on the upper end face 2!; of the tube 22, which
face 24 constitutes a seat for the valve 23. This
tubular valve 23 is preferably provided with a
plurality of ports 25 through its wall. Means is
provided for admitting the gas to the inlet end
65 of tube 22, that is, the lower portion of the tube
22 below the air valve seat, in the present illus~
tration of the invention, so that this gas passes
upwardly, and after passing the valve seat 2t
will pass outwardly through the ports 25 into
70 the interior of the hood l5. The upper end of the
hood [5 has an outlet 28, which preferably is
formed in the neck 2'? that projects up into the
lzgone of smallest diameter of the tapered charn~
er 1.
The air valve disc I3 is preferably secured to
10
metrically opposite openings 3! formed in the
stricted passage 9 at the point where the neck
to the bonnet 3 I provide an air valve seat in
30 the form of a ring I ll, said ring is preferably
having a conical bore H on its upper side, and
presenting a flat inwardly projecting ?ange E2
to present a seat face for the disc E3 of an air
75
the tubular valve 23 by threads as illustrated, and
the check nut 28 employed to ?x these parts in
any adjusted position. I may provide means
below the air valve seat It! for regulating the
on the other end of the shaft 3‘! of this throttle
valve I attach an adjusting lever 38 having the
slot 39 cooperating with a locking screw 4%! for 30'
setting and locking this throttle in any desired
position.
'
The base 2, preferably at a point diametrically
opposite to the air inlet 29, is provided with a boss
at having a chamber d2 within the same into 35.
which gas may be admitted from a gas supply
pipe 53. The inner end of this chamber e2 extends
around the lower end of the tube 22, and the tube
at this point is provided with ports 44 for admit
ting the gas so that the gas will pass upwardly
through the tube.
If desired, means may be provided for regulat
ing the effective area of the port 44. For this
purpose I may provide a plug 45 movable in the
bore of the tube 22 and having a threaded con
nection with an adjusting stem. 46 that projects
outwardly through the head 41 of the lower end
of the tube, and a check nut 48 may be provided
for locking this plug 45 in any desired position.
In Fig. 2 it is represented at a considerable dis
tance below the ports 44.
A stuffing box 49 is preferably provided, the
gland 5?] of which can be held in any adjusted
position by a set screw 5|.
The gas valve 23 is preferably provided with
means for nicely adjusting the quantity of gas
that can pass this valve, and for this purpose I
prefer to employ a hollow plug 52, which is thread
ed into the upper end of the valve 23, and this
plug preferably has a relatively long tapered tip
53. With this construction it will be evident that
by reason of the downward taper of the tip 53, as
the valve 23 rises off of the seat 24, the effective
opening through this valve will gradually increase.
It is also evident that by adjusting the plug 52
upwardly the effective opening will be larger and
the how of gas. will be increased.
The plug '52 is preferably held ?xed by means
of a check nut 54.
In the upper section 4 of the apparatus I pro
vide an admission valve 55, and at the point
where this admission valve 55 is located, the cas
ing is preferably of substantially rectangular or
70
square cross section, and the valve 55 is also
rectangular or square. This valve 55 is secured 75
/
3
2,128,711:
to a shaft .56, the ends of which project outwardly
‘through the walls of‘ the casingisection 4, and
position 'untilxth-e clutch on the engine is closed
this shaft 56 is located nearer one edge of'the
valve 55 than the other so as tonp-roduce an un
will be slowed down temporarily, thereby reducing
the partial vacuum in the intake 5, whereupon
balanced area for the valve; that is to ‘say, :the
the load arm 59 will swing the valve 5:5 back to ‘its
flap 55a. of the valve located toward the ‘left as
viewed in Fig. '2 has‘ considerably greater area
the engine _is. working.
again.
As soon as this occurs the idling engine
open position, corresponding to the period when
-
The apparatus should be constructed so that
even when the gas valve 23 is closed, the air
valve disc l3 will be held slightly away from the 10
?ange l2 of the seat It].
Fig. 'lillustrates the air valve in its wide-open
the velocity of the explosive mixture ?owing past position with the ?ange it up against the wing
it. In order to accomplish this,v the shaft 55 vof stops 63. In this position the gas valve will rise
this valve is provided with an arm. 51, which I so far that the regulating plug 52 will be nearly 15
prefer to call va “pick-up” arm, and when the withdrawn from the end of the tube.
If desired, the apparatus may be constructed
apparatus is at rest, this armlhangs in a substan
tial-ly vertical position against a stop screw 55 (see with adjusting means for adjusting the air valve
Fig. 1). In- addition to this arm 51, I prefer to seat toward the air valve. This is illustrated in
provide means for o?-ering a‘ resistance to the Fig. 8 in which ma indicates the air valve seat.
upward swing of this arm 51, and for this puré This seat is rotatable in the bonnet‘ 2a of the
pose I prefer to provide a resistance arm or- load casing, being provided with a plurality of screws
6% that pass outwardly through inclined slots 65
arm 59, normally resting on a stop screw 59a.
When the arm 57 swings toward the left as viewed in the wall of the casing. A spring is provided
in Fig. 5, a pin 60 projecting from its inner side. for urging this seat in one direction, preferably 25
engages the edge of the arm 5-9 and lifts this arm. toward the air valve disc 93a. This spring is
This greatly increases the resistance to swinging preferably in the form of a spring washer 66
of the arm 51. In normal operation, however, the seating on an annular shoulder Bl formed in the
pin 60 merely rests against‘the arm 5-9 without casing 2a just below the valve seat Illa. This
lifting it, as illustrated in Fig. 5; but when the spring washer is illustrated in Fig. 10. It has 30
than the flap 55b of this valve located toward the
right. Even in the closed position of the valve it
10 does not completely shut off ?ow of explosive mix
ture past it toward the uptake 5. This valve 55
is freely movable on its axis, and is controlled by
15
_
20
25
30
arm 5? picks up the resistance arm 59 it can
swing it toward the left until a set screw 6! car
35
a large central opening 68 through which the air
can pass upwardly, and at its margin it is formed
ried by the arm 59 engages a stop 62 projecting
with integral tongues 69, which project circum
from the upper end of the part A. '
ferentially, and which are struck out from the
material of the plate. These tongues act as four
springs engaging the under side of the seat Hla
to force the same upwardly. By using this spring
it is unnecessary to use great accuracy in the
?t between the pins or screws 64, and their slots
It should be understood that in the operation
of this apparatus the air valve It with its disc
I3 rides or ?oats on the air current passing it,
and it can be raised to a considerable distance
from the seat ill by the air current, being limited
in this by stops in the form of wings 63 that
project inwardly into the chamber 1 at its largest
diameter. It will also be evident that the‘ further
the air valve Ill rises off its seat, the further the
valve 23, carried by it, will rise off of its seat 24.
In this way the admission of gas through the
gas valve 23 is proportional to the admission of
air through the air valve. Furthermore, it will
be evident thatthe gas that passesthe gas valve
will pass up through the neck 25 and be delivered
50 right into the center of the air stream ?owing ‘up’
through the chamber ‘l, and at this point a ven~
turi eifeot is attained by reason of the restricted
diameterat the point 9. ‘In the regular opera
tion of the engine the throttle 35 will have been‘
In the embodiment of the invention illus
40
trated in Figs. 11 and 12, the air valve pconstruc~
tion is considerably altered, and the hollow bon
net it of Fig. 2 is omitted. In this case the air
valve is of crown form, and includes two tele 45
scoping crowns including an outer crown it and‘
an inner crown l I, said crowns having peripheral
walls that telescope together, and having discs
12 that abut against each other. The peripheral
walls of the crowns have a plurality of slots 13, 50
which may register with each other more or less
to regulate the quantity of air that can pass up
through the valve. The two crowns l9 andv "H
can be held in any adjusted position by means of
a set screw ‘M passing through a slot ‘Ma in one 55
55 set to a more or less open position to pass suffi
cient explosive mixture to the engine to enable - of the .discs '12 and secured in the other (see Fig.
12). This view also shows a .feed tube 75 into
it to run on its load, and in the regular opera
tion of the engine the valve 55 will be hanging in
a more or less vertical position but inclining to
60 ward the left at its lower end, that is tosay, the
unbalanced flap 5%. Now, assuming "that the
engine is running on regular loadkif the clutch
is opened, the engine will immediately commence
to race because it is. suddenly relieved of its lead.
65 This will cause an increased velocity in the ‘ex-
~ plosive mixture passing up through the casing and
will cause the valve 55 to move to its “closed”
pick-up
position arm
as indicated
5? will pick
in ‘Fig.
up the
2. resistance
In doing this
arm 55
70 and swing it up against its stop {52. Of course,
as soon as the valve 55 “closes” the engine will
reduce its speed and will commence to idle on the
explosive mixture that flows past the vvalve 55in
its “closed” position. The vacuum developed in
the intake .5 will maintain the valve '55 in this
which gasoline may be fed automatically by a
nozzle 16 supplied with gasoline through a pipe
‘ll and controlled by the usual ?oat (not illus
trated) so that the gasoline level will stand at
about the tip of a needle valve ‘58 that extends up
through this ?tting from below. This ?tting in
cludes a bushing 80 with a plurality of air in
lets 8| for drawing in air up through the tube (35'
W. The upper 'end of the tube 75 operates as a
seat for the gas valve 82, which includes an outer
tube 83 with ports 34 through its wall, and which
also includes a plug 85 that screws down into the
upper end of the tube 82 and presents an an~
nular shoulder 86 to rest against the end face
ill of the tube 75, which constitutes the seat for
the fuel valve.
In this construction it will be
noted that the air valve moves freely through
aniopening 88 in the casing opposite the regis
2,123,711
tering openings 13. As the air valve rises off its
seat, of course a larger area of the openings 13
will rise above the wall 89 that carries the open
ing 88, thereby increasing the flow of air. This
air as it passes upwardly, mixes thoroughly with
the carbureted air that passes the fuel valve 82.
The air-valve I4 is preferably constructed of a
metal having a low speci?c gravity, such as alu
minum.
10
It is understood that the embodiment of the
ing with the tube to'control the admission of
gaseous fuel into the interior of the bonnet, said
casing having a seat for the air valve and said
tube cooperating with the gaseous fuel valve to
hold the air valve off its seat in the closed posi
tion of the fuel valve.
4. In a feed apparatus for connection to the
intake of an engine driven by gaseous fuel, the
combination of a casing having an upwardly
tapered chamber, a ?oating air valve mounted in 10
invention described herein is only one of the
many embodiments this invention may take, and
the chamber for controlling admission of an air
current through the said chamber and operating
I do not wish to be limited in the practice of the
invention, nor in the claims, to the particular
15 embodiment set forth.
to ?oat on the said air current, means for guiding
What I claim is:
>
1. In a feed apparatus for connection to the
intake of an engine driven by gaseous fuel, the
combination of a casing having an upwardly re
20 duced chamber, a ?oating air valve mounted in
the reduced chamber for controlling admission of
an air current flowing around the same through
the said chamber, operating to float on the said
air current, and constructed so as to vary the
25 effective area of ?ow for the air current as the
air valve rises and falls on the air current, a guide
tube for guiding the air valve along the axis of
said chamber, means for admitting gaseous fuel
to the said tube, and a fuel valve carried by the
air valve for controlling ?ow of the gaseous fuel
from the upper end of the said tube into the air
current, and including a tapered tip projecting
downwardly into the upper end of the said tube,
said parts cooperating so that an increased rise
35 of the air- valve increases the velocity of flow of
the air current, and thereby increases the ?owiof
fuel through the fuel valve.
2. In a feed apparatus for connection to the
intake of an engine having a throttle valve, driven
40. by gaseous fuel, the combination of a casing hav
ing an upwardly tapered chamber, a free ?oating
air valve independent of the throttle valve,
mounted in the chamber for controlling admis
sion of an air current through the said chamber
45 and operating to ?oat 0n the said air current, a
substantially conical hood carried by the air
valve, and having an upper outlet for admitting
the gaseous fuel into the air current at a point
adjacent the upper, small end of the tapered
chamber,
a guide tube for guiding the air valve
50.
along the axis of the chamber, means for admit
ting gaseous fuel to the said tube, and a fuel
valve carried by the air valve and cooperating
with the tube to control the admission of gaseous
01 Cl fuel into the interior of the hood, said parts co
the ?oating valve along the axis of said chamber,
and a fuel valve rigid with the air valve for ad
15.
mitting gaseous fuel into the air current, and
moving up and down with the air valve, a ring
forminga seat for the air valve, said casing be
ing of substantially circular cross-section at said
ring and having inclined slots therein, and said
ring having pins running in said inclined slots
and enabling the ring to be moved toward or
from the air valve by moving the ring to and fro
on its axis.
5. In a feed apparatus forconnection to the
intake of an engine driven by gaseous fuel, the
combination of a casing having an upwardly
tapered chamber, a ?oating air valve mounted in
the chamber for controlling admission of air
current through the said chamber'and operating 30'
to ?oat on the said air current, means for guiding
the ?oating valve along the axis of said chamber,
and a fuel valve connected with the air valve so
as to open proportionally with the air valve and
admit gaseous fuel into the air current, a ring ‘1
forming a seat for the air valve, said casing being
of substantially circular cross-section at said
ring and having inclined slots therein, and said
ring having pins running in said inclined slots
and enabling the ring to be moved toward or 40
from the air valve by moving the same to and
fro on its axis, and a spring for urging the ring
toward the air valve seat.
6. In a feed apparatus for connection to the
intake of an engine driven by gaseous fuel, the
combination of a casing having an upwardly
tapered chamber with a contracted upper por
tion, a mechanically free ?oating air valve
mounted in the chamber for controlling admis
sion of an air current through the said chamber
and operating to be raised by, and ?oat on, the
said air current, said valve having a tapered up
per portion terminating in a nozzle smaller than
said contracted portion and of such length as to
enter the contracted portion when the valve rises 55
operating so that an increased rise of the air valve _ and thereby change the effective ?ow area be
tween the side of the valve and the wall of the
thrusts the said upper outlet of the conical hood
tapered chamber, a guide tube extending up
creasing the suction effect on the fuel outlet and through the air valve for guiding the air valve
along the axis of said chamber, means for ad 66
60 increasing the feed of the fuel.
3. In a feed apparatus for connection to the mitting gaseous fuel to the said tube, and a fuel
intake of an engine driven by gaseous fuel, the valve carried by the air valve so as to move as
combination of a casing having a bonnet with one piece with the air valve, for controlling ?ow
an upwardly tapered chamber, a ?oating air of the gaseous fuel from the upper end of the
said tube into the air current, and means for
65 valve mounted in the chamber for controlling
admission .of an air current through the said regulating at will the distance between the air
chamber and operating to ?oat on the said air 7 valve and its seat.
current, a substantially conical hood rigidly car
'7. In a feed apparatus for connection to the
ried by the air valve
an upper outlet for
intake of'an engine driven by gaseous fuel, the
admitting the gaseous fuel into the air current combination of a casing having an upwardly
at a point adjacent the upper, small end of the tapered chamber with a contracted upper por
tapered chamber, a guide tube for guiding the tion, a ?oating air valve mounted in the chamber
air valve along the axis of the chamber, means for controlling admission of an air current
for admitting gaseous fuel to the said tube, and a through the said chamber and operating to ?oat
on the said air current, said valve having a ta 75
75 fuel valve carried by the air valve'and cooperat
furtherinto the tapered chamber, thereby in
2,128,711
pered upper portion terminating in a nozzle
smaller than said contracted portion and of such
length as to enter the contracted portion when
the valve rises on the air current thereby oper
ating to reduce the flow area for the air current
between the side of the air valve and the wall of
5
said chamber, and having a tapered tip at its
end projecting down into the upper end of the
guide tube to regulate the ?ow of the fuel, all of
said parts cooperating to attain a variable ven
turi effect on‘ the fuel valve.
10. In a feed apparatus. for connection to the
the tapered chamber, means for guiding the
intake of an engine driven by gaseous fuel, the
floating valve along the axis of said chamber, and
combination of a casing having a tapered cham
a fuel valve rigid with'the air valve for admit’
10 ting gaseous fuel into the air current, and oper—
ating to open proportionally with the degree of
opening of the air valve, the reduction of said
?ow area operating to increase the suction effect
and increase the flow of fuel through the fuel
15 valve.
8. In a feed apparatus for connection to the
intake of an engine‘driven by gaseous fuel, the
combination of a casing having an upwardly
tapered chamber, a ?oating air valve having a
20 valve disc at its lower end for controlling the
admission of air, and having an upper extension
projecting up into the tapered chamber for con
, trolling flow of the air current through the said
chamber, said valve operating to be raised by,
ber, a floating air valve mounted in the chamber 7
and cooperating with the wall of the chamber to 10
form an annular air passage, said valve having a
seat cooperating with the same for controlling
admission of an air current through the said
chamber and operating to be moved bodily by the air current away from its seat, so as to pro 15
portionally reduce the area of said annular air
passage as the valve moves away from its seat,
a guide tube, said valve having a tube sliding on
the valve tube for guiding the air valve along the
axis of said chamber, means for admitting com
20
bustible fuel to the said tube, and a fuel valve
rigidly carried by the air ‘valve so as to move up
and down in unison therewith, for controlling
flow of the fuel from the upper end of “the said
_
25 and ?oat on, the said air current, means for‘ tube into the air current.
25
guiding the floating valve along the axis of said
11. In a feed apparatus for connection to the
chamber, and a fuel valve located above the disc intake of an engine having a throttle valve and
rigid with the air valve for admitting gaseous fuel driven by a gaseous fuel, the combination of a
into the air current, said fuel valve operating to casing having a chamber of reduced diameter in
30 open proportionally with the opening of the air its upper portion and having an extension above
valve, a ring forming a seat for the air valve, said reduced upper portion of quadrangular
and means for adjusting the said ring toward or
cross-section, a freely movable self-opening
35
from the air valve to regulate the air ?ow through
valve pivotally mounted in the said extension of
the same.
said casing above the chamber of reduced diam
eter and between the chamber and the throttle 35
9. In a feed apparatus for connection to the
intake ‘of an engine driven by gaseous fuel, the
valve of the engine, said self-opening valve hav
combination of a casing having a chamber with
a reduced portion, a mechanically free ?oating
ing an unbalanced area located below the axis of
its pivot and mounted so that it will remain open
when at rest but will assume a nearly closed posi
tion when a relatively high partial vacuum is de 40
veloped in the engine intake when the engine is
idling, an air valve loosely mounted for free up
air valve mounted in the chamber cooperating
40 with the Wall of the chamber to form an annular
passage around said valve, for controlling admis
sion of air current through the said chamber and
operating to ?oat on the said air current and be
moved bythe air current toward the reduced
45
portion of said chamber so as to reduce the area
of the said annular passage’ proportionally as
the valve advances, a fuel feed tube operating to
guide the ?oating valve along the axis of said
chamber, and a fuel valve rigid with the air
valve so as tov move up and down in unison there
50 with for admitting gaseous fuel into the air cur
rent adjacent the said reduced portion of the
and-down bodily movement Within the reduced
chamber for controlling the admission of air for
combustion to the said chamber, and operating
to ?oat and be supported solely by the air cur 45
rent pas-sing upwardly through the said chamber,
and means associated with the air valve for ad
mitting gaseous fuel into the upper portion of
said chamber.
GEORGE S. MASLEN.
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